I would say yes - only because my D300 has been such an amazing sports camera for almost 10 years now. Keep in mind, I can say this while the camera was surviving perhaps the fastest-paced period of evolution DSLRs have ever seen.
And yet it seems to have come out on top, in terms of design, layout, reliability, etc. it really is a perfect camera for me. I never really "knew" I needed the connectivity advantages or beautiful color rendering the D7200 offers - but wow if the D500 can meet the IQ and prove to be an evolutionary jump in connectivity, all the while sustaining the amazing handling and build quality of my beloved D300.. I think the D500 could easily prove to be a camera that is.. in a word.. perfect (for what I do anyways).
It's a little ironic in that the D300 forced me to hone-in my low-light skills to near perfection to squeeze out every shot I could in indoor sports arenas and such. This is a foregone conclusion with the D7200 as it's just exponentially better on all fronts in low light - but I'd imagine the D500 will be like holding my D300, with the addition of effortless low-light shooting AND a constant amount of "headroom" available that will seriously make me feel invincible while I'm out there shooting.
I just can't wait. I must be one of the few people that ISN'T horrible frustrated that they made the announcement only weeks after buying the D7200.
I prepared myself for the size, weight, shape, control dial, etc etc differences of the D7200 for a few weeks before pulling the trigger, and no matter how amazing the results of the little guy - picking up the D300 still give me that "I'm home again" feeling. Early on I found myself selecting certain menus, or turning the camera on-off-on and I was just FRUSTRATED at the lag. This was before the D500 was announced, and it was at that moment that I truly felt abandoned by Nikon. I was holding their best DX camera in the world, and my 10 year old D300 was amazingly faster still (I have the grip/EL4 so I'm at 8fps also).
While there may be tweaks, video updates, new additions to connectivity, etc - the fundamental scenarios this D500 can shoot and excel at; low-light sports for example, should provide results at a level which will be at the very least, EASILY "acceptable" for another decade +. Even then, it's so near the theoretical boundaries of the DX platform that it may very well stay near the top of IQ for the foreseeable future - upgrades will be in other areas.
This is the camera I've been waiting for, and from what I've seen - it'll easily solve and surpass any and every concern I've ever had (or could ever think of) in the field with my D300. I really can't wait.