Clif, you are exactly on the mark from a user perspective - one operating system hosting everything. There is a product like this available but with little style support, namely,:
https://www.evolution-uk.com/acatalog/software_online.htmlWe are relatively close with Brainspawn's forte which is specifically designed for live performances.
Could another alternative be where OMB and otheres are re-done as a VSTi/DXi?
Jos, what once may be a nickle and dime market can become a multi - million dollar market! This will depend on control surfaces, software, computers and so on. It will also depend on alternatives and their costs.