Naw.
Reagan Democrats have dwindled in number. Most have switched or passed on. Anybody who remains a Democrat is either on the left or utterly malleable by the leftist media.
When crunch time comes, few Democrats will not vote for Hillary. What we need is a good conservative to turn out the conservative/tea party vote.
If by "Reagan Democrats" you mean, living, registered Democrats who were registered Democrats in 1980 and who voted for Ronald Reagan, then, of course, you are right that their numbers have dwindled.
I'm using the term more broadly, to mean white men with real jobs who are supporting a family, not on welfare or SSDI, their wives, and their adult children who have been consistently voting Democrat because they hate the local Republicans and are afraid that their kids won't be able to get good jobs.
There are lots and lots of them. If you don't think so, you need to get out more.