The 10nm bomb has hamstrung them. If the process was on time they would have expanded production and built new fabs as usual and AMD's revival wouldn't be quite proverbial phoenix.
But at this point they're better off focusing on their 7nm process for 2023.
Us enthusiasts/desktop/gamer crew are a small group in relative terms. Fab space is precious, and the bean counters have probably concluded that it doesn't make sense for intel to sell the 8700k for 3600 prices when they have gargantuan OEM's breathing down their necks to fulfill orders.
Right. And with that Intel are not just fighting a resurgence AMD in their back yard, Intel's cash cows are developing their own custom CPU's to cull their reliance on AMD and primarily Intel.