We were up there with Redknapp until an epic crumble/bottle job and around 87 we looked like we could but that ended badly too.
I don't really think we had any potential in the 90's with United around just like most of the league. We are closer now than we were back then but even still it's not going to happen
The new tv money that's coming in won't help clubs like Spurs. A few clubs dreamed about and budgeted to get into the top 4, partly for the prestige but mostly for the gravy train. The new tv deal means missing out on Europe isn't that big of a deal, and I sense that quite a few clubs will settle just for being an established prem team.