Is 1970-1990 Football the Next Collector Card Growth Era?

[G1911]

I think the supply of nice copies is pretty large by the time we get to the 70's. Just pulling some of the big ones for each decade:

1970 OJ - over 1,500 in PSA 7-10
1972 Staubach #200 - over 1,000 in PSA 7-10
1976 Topps Payton - over 5,000 in PSA 7-10

There's some regrades, plenty in SGC, Beckett holders and plenty more that are raw and in NRMT or better condition still (Greg Morris seems to have several a week sometimes), so there are many more than this number. I'd call this a large supply considering the interest in football history.

For the 80's, it's what I would think is massive:
1981 Montana - over 15,000 in PSA 7-10
1984 Marino - over 19,000 in PSA 7-10
1986 Rice - over 21,000 in PSA 7-10

I think it's true that there is a shortage of nice and clean examples for the 50's:
1952 Bowman Gifford - less than 100 smalls, less than 100 larges in PSA 7-10
1957 Starr - less than 500 in PSA 7-10
1958 Brown - a hair under 700 in PSA 7-10

I'm sure the 10's will prove nice investments for the investors, but I'm not sure there's a market for these to explode across the board when there are so many clean copies out there for players who don't have the historical interest the baseball legends do. I think the high end 50's stuff will do great, only a fraction of the interest is needed to throw off the supply demand equation there.