The descriptions of Barad-Dur everyone has said pretty much speak justice to it. If/when we eventually get to Mordor, I very much doubt we'd get into Barad-Dur. Cause once the ring is destroyed, Barad-Dur gets demolished (I'm sure not quite in the style of Peter Jackon's version, probably where the foundations were wrecked, and the Free Peoples destroyed the rest, like the survivors of the Last Alliance did before).
Plus I very highly doubt we'd get in before the Ring is destroyed. Since you'd have the battle of the Black Gate and all that to deal with.
And I for one would not want lotro to pull what LOTR: The Third Age did. The idea of fighting Sauron's eye on top of Barad-Dur was just ridiculous.
In conclusion, would it be cool to see Lotro's version of Barad Dur in the future? Yes. Would I be disappointed if it didn't happen? no
[COLOR=#0000cd][B]Eodread, Earendel, Isilmacil - Horizon[/B][/COLOR]
[B][COLOR=#ff0000]Thattickles, Thangorodread - Table Smashers[/COLOR][/B]