It's nice to see both Sigma (Dp) and Sony (Rx) the compact market with decent image quality, where Nikon and Canon have basically given up any attempt to service those markets.
And the situation is similar with compact system cameras. For better or worse, the sales of "large sensor cameras" (I count from about 4/3" format up) are still dominated by SLRs --- and specifically Canon and Nikon SLRs. So those companies still have little motivation to invest heavily in new types of cameras that they likely see as mostly attracting customers who would otherwise have bought one of their SLRs, so that the extra R&D expenses would not generate a sufficient nett increase in sales revenue. My hope is that sales of these new camera types eventually becomes too strong for the big two to ignore.
P. S. There is a flip-side: every other camera maker (35mm format and smaller) has abandoned the traditional SLR with OVF, and Sony seems set to move on from its EVF SLRs, leaving only two makers of any kind of SLR.
EDIT: As Bernard pointed out, I forgot that Pentax still offers SLRs, having fumbled badly its first attempt at a mirrorless system, so maybe Pentax wants to move to the "SLR alternatives" but has not succeeded yet. Maybe that oversight was a Freudian slip, as I fear that Pentax is wandering into irrelevance, not even getting the newer sensors offered in Sony and Nikon SLRs.