Your link only mentions Warner and Pace as Rams, I'm assuming you mean Torry Holt and Isaac Bruce as the other two.
I'd put Warner and Pace in the Hall easy. For the WRs I dunno. I think it's a little difficult to place them. Holt needed better longevity, Bruce needed a longer peak. I take their places on All-Time ranks with a grain of salt with the explosion of the NFL being a passing league.
Do I think they get in? Yes. There are few teams that have a certain significance about them in which they rise above others. '72 Dolphins, '85 Bears for example. The '99 Rams are frequently cited and so I think because those receivers were part of that, it will eventually lift them into the HOF.