Just buy an old one after your current one breaks if you love Magsafe so much. I'm sure many will be willing to sell their old 2015 Macbook pros when one with wireless charging comes out in 2023.
Seriously though the next iPhone/iPad will surely going to use USB-C also and ditch Lightning, which will dramatically simplify the connector situation going on at Apple.
If they were going to do that, then iphone 7 would have released with USB-C. At the moment I guess they don't want to break compatibility with every iPhone accessory on the market - but then again, they were never a company that cared about breaking standards, so I have no idea why the hesitation now.
* USB
* Not needing a $25 adapter just to charge my iPhone
* Thunderbolt for my two Thunderbolt displays
Hopefully the used supply of MBP will stay deep for years.