Darkbreeze :
Intel has yearly gross income comparable to several small countries, so a few million or even a billion in R&D might sting, but it definitely wouldn't hurt them in any impactful way.
If Intel halted all production and sales of CPUs until all plausibly exploitable flaws were fixed, they'd also lose tens of billions in sales in the meantime and billions more in repeat sales due to the R&D cycle getting extended by several months just to do the extra research to identify any possible new exploits that may have crept up in the new design.
Also, don't forget that people are ultimately going to have to pay for all this extra overhead and those lost opportunities. I'm hopefully being sarcastic here when I say: "hello $200 Pentiums."