Just pretend I took everything that Klaus said, quoted it, and added "me, too!' because, seriously, great stuff.
I'm a post-ToT Forgotten Realms afficianado, because that's when I was introduced to the Realms. I never had that attachment to the "real" Realms to lose. (Also, the ToT-enabled Baldur's Gate plots were great.) However, I never really glommed on to the 4E Realms; I'm okay with, say, the Shadow empire reappearing, but the whole Spellplague thing (and Mystra dying ... again ...) were turn-offs.
Similarly, Dragonlance's "nothing happens for a long, long, long time, and then within 50-or-so years the world ends three times!" metamorphoses completely soured me on the setting.
Eberron, to me, is set right at the cusp of a whole bunch of really interesting and cool things happening that flow really naturally from the setting: New Cyre's about to do something; what? Aundair's about to try something; what? Droaam just showed up; what's that going to do? etc. Any given campaign could touch on some or all of these things, or none (Let's focus on Sarlona, instead!)
Advancing the timeline would require that you answer at least some of those questions, and I am not certain it's possible to do so in a way that doesn't absolutely piss off a percentage of Eberron's fans.
The one long campaign in Eberron I actually ran (a supposed one-off that turned into a year-long adventure!) actually took place during the last days of the War, and the players really liked it (except for the downer ending, since they were inside Cyre's borders when the Mourning hit; oops!).* Additional support - either in adventures or in rules modules - for "Last War Campaigns" would be welcome. I mean, the conclusion is somewhat foregone, but people play WW2 wargames all the time ...
* Of course, I've kept all my notes, so when I next get to run an Eberron campaign, things are bound to turn up.