I started off on the "No Merger" side but my guild has shrunk to around twelve actives, a few partially active (Once a week for gold-rolls) and a long list of friends who've drifted away.
-Condensing the servers into one would very likely
reduce lag because it isn't a resource 50/50 split to run two servers. There is a moderate efficiency loss to run separate servers. i.e. Multitasking requires more computing power. (At least with the systems I'm familiar with). Because I am not familiar with the hardware SSG is using now I could be mistaken.*
-A single server would afford new potential gameplay opportunities; server-wide events?
-When the community reaches a certain point I surmise that the loss of players will actually accelerate.
Given the cost to transfer one character- 2495 DDO points- and many of us have upwards of 8 mules, well established (Amenity-wise) guilds, and all the pitas a transfer would impose (Name's taken, clearing the TR cache, friends lists lost) folks may just decide to start fresh, with a more populous game.
https://www.ddo.com/en/world-character-transfer-guide
DDO is facing a point where they need to condense the player base or watch the players evaporate. With years invested farming gear, training skills, gathering lives, tomes and so forth, just starting fresh is not an option for many. It would be best for SSG to begin orchestrating voluntary transfers to a single server building on lessons learned to make it more efficient- guild ships mirrored, toon stables transferred, under a controlled process- rather than losing more players.
There would need to be limitations, too. Minimum guild sizes and only those with multi player activity (Not mule guilds- I have one, I'll say good-bye to it.) 20+ toons on each server are not going to all be brought into one server. We all have our mains, our test toons, our name holders and our mules. Some are going to have to go to the bit bucket. Let's face it; being able to bring our primaries and some of our mules onto one server would be much better than starting from scratch in a completely new game. We'd still be somewhat in our comfort zone.
Or...
Faced with a game that is essentially a ghost town and having to start completely fresh (or pay much to transfer all our hard won bits and abandon some significant investments- guild, friends, etc- we may just decide to find a new, more alive game. Not a threat- so long as I have time I will play DDO into its dying days. But I think a decision soon that provides a developed and incremental transfer for free- or at least at a significantly reduced cost- to make it as small a pain in the butt as possible would extend the games life.
SSG plans to stay alive for a while- ongoing development, balance, and they're looking at the screen size increase issue (Bigger screen, smaller GUI) and reducing lag. This is a discussion they need to have.
The OP has a valid concern, the conversation needs to be had. Hearsay doesn't have a place in the discussion- "I know thirty people who don't want it," doesn't fly. If you know six people who agree with your thinking- real people not six accounts with three posts to their name- ask them to join in.
I'll just speak for myself- my mind changed already since the last discussion. I'm for a merger, at this point. The HC server showed what a huge population was like and I really enjoyed it despite my soloer ways.
*I've been careful to temper my own input on the technical aspects as limited to my own understanding. Some of you may be able to correct me if I'm wrong in this instance.