Moore's law will come to end eventually, in fact we're seeing it happen already. Intel and AMD have hit the wall and are going sideways, exploring multi-core processors in an effort to get more.
Make single chips smaller and faster won't be possible for very much longer, since you run into fundamental problems like running out of metal to push electrons down, or clock signals across a die being limited to just under light speed. Multi processors run up against problems of running shared memory and shared caches, as well as the problem of how to split up tasks efficiently.
There are many technical challenges, and while there's probaly room for a few more bigger-faster-better type chips, I think the real future lies in something totally different and as yet unthought of.