I'd like to see scroll vendors removed completely, as it spoils several important game mechanics.
1. Wizards ability to inscribe scrolls that they find - this is only used with level 8/9 spells, really. All the 1-7 spells can be bought from a vendor before leveling up, and then just select the ones that aren't for sale.
2. Spell point balancing - the ability to carry mutiple stacks of scrolls has caused Turbine to develop content that presumes that people have them.
3. Devaluing of class features - Who cares that Rangers/Paladins/Bards can cast Cure spells? Just splash Rogue/Bard/Arti and use Heal/Reconstruct scrolls. Why slot Teleport/Greater Teleport? They work just as well from scrolls.
4. Devaluing of loot - scrolls found in chests now are the first to be sold to the bartender, and the first to be destroyed when inventory is full. I do get excited when I find Dimension Door scrolls, though.
And to illustrate my point, here's an Order of the Stick comic
http://www.giantitp.com/comics/oots0058.html