I'm no expert but I think you may be a bit confused.
Your "Perl 5 Compiler, Again!" thread definitely did NOT prove that the "compiler topic is near impossible to solve". That thread was basically just one tit-for-tat between chromatic and Reini Urban, who are on opposite sides of the fence on this particular issue, and who are apparently also not the best of friends. Nothing solid can be deduced from that thread.
The bytecode issue is only one aspect of the complicated optimizing problem. We may be able to produce a Perl 5 optimizing compiler without use of the Perl bytecode system at all. On the other hand, bytecode may turn out to be a critical component in optimizing, only time will tell.
Perl 6 seems to be a pipe dream. Perl 5 seems to be stabilized and mostly in maintenance mode. I'm not interested in creating Perl 7, since Perl 6 needs to happen first, if ever. I'm interested in compiling & optimizing Perl 5, and this is what I will achieve. :-)