What-if futures are the dreams of many ex-Amiga owners. Personally, I consider the issue entirely moot. We have Cray supercomputer performance from mobile phones, these days. Any amount of progress, whether it stemmed from our timeline of IBM-PC clones winning out as the dominating force, or the alternate timeline of Amiga OS based computing being the leader, we would still be in a mostly similar position today.
The only real difference is the GUI. Hardware would have been the same, though maybe Power CPU's instead of Intel may dominate. Graphics cards would be the same, hard drives, RAM, motherboards... the whole top-to-bottom of the PC tech industry would be doing very similar things, no matter what. Convergent evolution.
We would still have our Java's, our Flash, our legacy features still present in our CPU's and BIOS. Malware would still exploit the same weaknesses and the internet would still use the same protocols and run at the same speeds.
The question you should really ask is: What would things be like today if Amiga coding ethic was now the main driving focus of software development?