We have Apple, ARM, Intel and soon AMD is rumoured to be going big little with Zen 5 so I don't think it's a short term fad but rather the direction the industry is moving.Because big/little is short term solution to offer as many cores as AMD, once they find tiles/chiplet solution they won't need that little cores and they will offer more big cores while having good yields because of MCM design. If not 2d, then 3d stacking cores will kill big/little no doubt.