Compendium for D&D 3.5

I believe that there should at least be a compendium of 3.5, with reformulation of the chips. Although 5E is a good game I think 3.5 deserves.

I 100% agree... as a hardcore 3.5er it's a must have... the good news is that Roll20 have regularly stated that they want to open up the compendium to  other systems that are covered by OGL. First however they want to make sure that the base model (5e specifically and Pathfinder by extension as the original compendium system) are rock solid and bug free before they open up to other systems.