The problem with this idea is that it won't work for many, maybe even most, of TiVo's users.
I've had that same issue with Haven and wasn't home last night to know if it failed yet again. My older TiVo HD is on the wife's set, so after getting burned twice on Haven I ended up setting hers to record it too just in case (her SP list is very short, since she treats it like live TV!!).
I too really dislike the TA, but my watching habits since getting a TiVo would in no way benefit from this kind of alert. A better solution would be to figure out the TA problem. The *best* solution would be to come up with a way to give those of us who don't want cableco DVRs to get all the same benefits theirs offer, including full two-way communication, PPV, On Demand, everything!
TiVo Premiere XL - Oct 2012 - Lifetime
TiVo HD - Sep 2007 - Lifetime
TiVo Roamio Plus - Oct 2014 - Lifetime