Yes there will be old rifles in years to come.

I have both, old and new and I shoot and hunt with both.
However if going into a swamp after Buff or something,
I would not take one of my "collector" double rifles.

I would still consider taking an old English (and have done so)
but I would more likely take my Merkel 470 next time,
especially if overseas.

However I do not shoot my English guns at the range much
so if you are planning on plenty of range shooting,
go new.

Good luck with your search.

500 Nitro