[Flipside]

Problem is, by the time we get good enough at getting around on Mars to fix it, we probably won't need any information it can gather

[InsaneBaron]

Meh, send humans. Instead of needing a specialised robot just to make Beagle work a human could do the necessary tasks in a spacewalk or two plus do a whole lot more.

At last, SOMEONE still understand the point of SPAAAAAAAAACE!

[Dragon]

Problem is, by the time we get good enough at getting around on Mars to fix it, we probably won't need any information it can gather

We already don't. The only purpose of doing that would be a PR stunt. Beagle 2 was a fairly low-cost vehicle, I think that it couldn't really do anything that the other missions didn't accomplish already.

[watsisname]

^Pretty much this.  For the potential payoff versus the time and cost required to send something to try to jumpstart Beagle 2, you might as well just make a whole new mission.