While the first half of your post may contain some facts, the second half about take over isn't credible at all.
What would Sony do with Nikon assets? Their product lines are impossible to integrate,...
Back on Kina, the lack of announcement may be disapointing, but Nikon's line up remains very strong for still photographers with the best sports camera (D5), the best DX camera (D500) and a 2 years old D810 that remains very competitive.
Honnestly, btw a me too a la 5DmkIV product announced now and a future proof D900 announced in 6 months my preference easily goes for the latter. Now we could also get a mo too D900 in 6 months and that would be disapointing.
In the mean time I am having a great time with the new 105mm f1.4, that may be the best portrait lens on the market, whatever the format...
I am open to any alternative who would help me to take better pictures but as of now Nikon remains IMHO the top dog when considering overall attainable image quality enveloppe (considering the D810 for low ISO and the D5 for high ISO,...), lens line up, AF performance,.. The only reason for opting out of Nikon now would be a concern about resell value. As a photographer who is more concerned about the images I take, I don't see value in applying an investment strategy to my photographic equipment.