That is a pretty ironic thing. It makes me wish we moved to IA64 instead of x86-64 but not much we can do now.Just going to point out something ironic: The Itanium architecture is immune to all variants of Spectre/Meltdown, due to being an in-order architecture that doesn't include all those wonderful x86 speedhacks that are now being taken advantage of.
Seriously, if Intel designed a new CPU architecture that was both secure and massively parallel today, it would essentially look like the Itanium architecture.
Unless Intel could write a new 64bit uArch that can work with current 64bit OSes but still ditch x86-64.
Interestingly enough, Sunny Cove is making a change to x86-64 by extending its useful bits. Although We can run 64bit now it was limited to 48bits addressable while Sunny Cove will have 57 bits addressable. Maybe that will mitigate a lot of these attack methods.
Last week Intel disclosed initial details of their next-generation core microarchitecture, Sunny Cove, which will make it into future Ice Lake client and server chips among other products.
Its a pretty interesting read.