I think to be successful, a cloud service must provide some real benefits over a local installation (i think that was the OP's intention, too). If all one would gain, is to save oneself from unpacking a zipfile or execute an installer there would be very little benefit, because the major work is not the unpacking, but rather for example the very common "missing texture" or "missing obj"-errors. If a solution for these would be included, perhaps someone would actually pay for it. Otherwise everything one would gain would be a slightly better ftp service. But that would require to make all this content available to actually work together and i have my doubts if this could be accomplished by unleashing all those 100s of content vendors into, e.g. one big cloud filesystem and letting them install their things (given the fact that a significant amount of content vendors are incapable of installing just one or two of their own packages without producing any errors).