+1 - seems to me - Part of the decision to adopt 4k is that you (a) accept a larger tv in your viewing room (houses are not increasing in size) so that the tv can fill a larger part of your viewing field and you can benefit from the increased resolution,
and (b) that you watch content in a darkened room to maximise benefit from the HDR.
I am not ready to meet these criteria so, currently using 42"ips @3m, i will hold off until the natural life cycle of my tv has expired ~3-5 years.
Absense of 4k content from the likes of the BBC&freeview, and equally, the streamed netflix/amazon 4K material only being equivalent to blu-ray at the current streamed bit-rates (maybe sky sport uhd excepted) are other disincentives - I can pick up those £1-2 blu-ray's and practically match the streamed content.
Whilst LG has the monopoly on emissive oled technology, it seems prices may stay high, too;
so, waiting until Samsung bring the emissive Quatum dot technology to market should see prices drop.