Respectfully, to each his own. With regards to a quality 1911, the Wilson, CMC and Tripp 8 round magazines will not wear out any faster than factory 7 round magazines. I promise.
If the sole reason you carry the 7's is to fit flush with the frame, you can get slim base pad 8 rd wilson's what only extend 1/8", provide the extra round and that style base pad is incredibly more durable when dropped and used a lot than the flat factory ones.
When in a gunfight, you may be very happy that you have that one extra round. You shouldn't need any ammo in the magazine to make it heavier so it drops free. If that's the case, something is wrong with your gun/mag. Also, you're expending onboard ammo. If you're in a lull in the fight and have the time/where with all to conduct a tactical reload, then prep your next full mag and when ready, get at it and try your best to retain the mag with the one round left. It may come in handy again at some point.
If you're still engaged in the fight, as in actively trading rounds or what have you, please don't try to count to one round left in the mag and fumble f*ck around...shoot until you're empty and at slide lock. That last round, doing your part, may be the fight stopper. It'll be well worth it at that point. Regardless, now is the time to get on the fastest speed load of your life and get that gun ready to go again.
In regards to counting rounds.... I'll admit that you may at the time have some realization as to the overall ammo expenditure...one round is one round, a few multi shot strings/bursts from a pistol or rifle should be anywhere from 7-12ish, etc. You may even "feel" the weapon being a bit lighter if it's one that carries a lot of ammo to start with. However, if you're focusing on cranking rounds off but strategically trying to stop with only one round left in the chamber, or one there and one in the magazine, then I believe you're not focusing on the right topic during a fight for your life.
I don't mean to ruffle feathers but, if I did, I'm ok with that. I intended to stick to my coffee and light reading this morning but, my 25+ years of real world use, training, instructing and having survived a handful of these "real world on the street educational seminars and quality of life reminders" have taught me a few things and made me even more opinionated. So be it.
** This all said, if the 7 round mags are your choice, then by all means stick with them. Train with them. Have several sets. Run your training ones hard for your sake and to test that brand. Have your duty/carry/CCW set of the exact same brand, style, model and test them on the range, but don't abuse them. Run them for function 2-3 times a year, clean them and continue on as your "life matters on these" carry set. If they don't perform 100% all the time, toss them. Magazines are expendable. People tend to hang on to them like it's the pistol itself. Guns can be repaired to as new. Some magazine problems can as well, but most are better served just getting rid of the piss poor magazine.**
Bottom line is that I thank you for stepping up and shouldering the responsibility to be armed and be available to defend yourself or others if that time comes. Many forget just what that all entails in the sense of responsibility, maturity, commitment and self risk.
Again, this is all just my opinion. I'm always open to new, tested and realistic ideas that come along.