, I really don't want to loose my shirt in few year finding my glass is past technology and is worth 50% or less because Nikon came out with new lenses for new mirrorless camera.
Why will you loose your shirt??? Even if your glass will become past technology, that I do not really foresee, first of all it will not get any worse than it is now. Not a iota. It will stay as excellent as it is now. You will still enjoy an excellent system.
And, second, you will be able to add more top DSLR glass, if it starts to sell at a heavy discount on
eBay. A win - win situation. Unless you are not looking at what you really need, but just chasing the latest and the bestest.
No one knows what will happen in 10 years, mirrorless may become just as obsolete as DSLRs. What if there will be those graphene sensors with 500 MP or a 1,000 MP and electronic zooms that will emulate a 200 mm optical zoom with no visible loss in IQ? All lenses will become obsolete. Do we need to start worrying about it now?