As it is, I have *already* put the Model S on the back burner. I was able to worm my way into the BMW field trials of the ActiveE, and am currently enjoying the electric life - until April 2014, when I have to return it.
Depending on the mood of my better half, we may get the Model S when my reservation number comes up, which will be Spring-ish of 2013, or we may postphone the build until later ("later" = To-Be-Determined). Currently the Model S is the front runner, slightly ahead of the Model X. Either one is a larger car than I will need to do my commuting, but I do need more than the "up to 100 miles" than the competitors are currently offering. (OKAY! I don't really "need" it, but I do "want" a range of at least 125 miles, so I can screw up one evening and not recharge the car and still get to work and back the following day. Don't ask me about this.) That, and I'm hooked on driving electrically already. You Roadster guys know this and get this.
If I were forced to abandon all my plans for a Model S or X, the list of suitable alternate electric cars is very short. Today, there are only a couple of mainstream possibilities, such as the Nissan LEAF or the Ford Focus Electric. Both have a range of perhaps 50-60% of the Model S' 40 kWh battery pack, so neither are very tempting (to me, anyway).
However, if I could hold off for a couple of more years, there will be several electric cars available. The Model X is certainly in the running here. The 2013 BMW i3 and 2013 Ford Focus Electric are the other possibilities that I am eyeing, as they are proudly projecting a range exceeding 100 miles. If this becomes true, then one of them may become my next (not-so-econobox) commuter.
If I knuckle under and start considering hybrids (and this is a BIG "if"), I would have a considerably larger list, but the waters get a bit muddier as there are cars like the Fisker and Volt - electric with an on-board charger; cars like the Toyota Prius, Honda Civic Hybrid, 2013 Ford Fusion Energi Hybrid - cars with a combo gas/electric powertrain and the methodology as to which one is used is not universal across the board, and limited all-battery range. And a slew of others. One of these may be suitable for replacing our ICE car, as it could be used for our 100 mile+ weekend and vacation trips.
-- Ardie