First of all, thanks for helping to finance the Librem 5. Purism never would have gotten this far if a lot of people like you hadn’t taken a chance and stuck with the project for 3.3 years.
My advice is to sell the phone if you don’t think that you can live with the weight and thickness of the phone, because that isn’t going to change. Once Purism can get suspend to RAM and wake on call working, I assume Purism can get the Librem 5 to a state where it has a 24 hour battery life, but it looks like that is going to take a while.
The one good thing about the Librem 5 is that it isn’t going to lose its value over time like other phones. The software is going to keep getting better and the functionality is going to keep improving. With lifetime software updates and the ability to change the cellular modem to support new/different LTE bands, the Librem 5 is going to have good resale value, because nobody else can make anything like it that will have better performance and can run on 100% free software.
The only chips on the horizon that will be able to make a phone with hardware kill switches that have better performance than Evergreen are the RK3588, RK3566 and RK3530 and it is unclear at this point whether there will be FOSS drivers for its new Mali “Natty” GPU. If Natty gets FOSS drivers, it will likely be 2-3 years in the future. I expect that it will be 3-4 years before PINE64 releases the PinePhone 2 with the RK3530, since it plans to first release an SBC to debug the design and PINE64 isn’t a company to do kernel development, so it is going to wait until others have perfected the mainline drivers. It is possible that some company like Olimex will release a phone based on the i.MX 8M Quad or Plus, but I think it highly likely that the Librem 5 won’t have any competitors in its market niche for the next couple years.
What this means is that you aren’t taking much of a risk if you put the Librem 5 in a drawer and wait a year to decide whether you want to keep it. Yes, the warranty will run out, but I’m pretty sure that you will be still able to resell it for at least what you paid for it in 12 months, because $599 is still 25% cheaper than the price of buying it new.
Looking at how long it is taking NXP just to release the i.MX 8M Plus, I don’t think you should fear Fir making Evergreen obsolete any time soon. Judging from how long it is taking to get mainline driver support for things like suspend to RAM and the MIPI CSI2 camera interface, I predict that it will be at least 2 years before the Plus has decent mainline driver support.
Even when Purism releases a phone based on the Plus, there will still be people who prefer Evergreen, because it has a significantly better GPU and VPU, so it is a better phone for convergence. It would not surprise me if there is still an active market for old Evergreens in 3-4 years time, because there simply won’t be a better Linux phone on the market for convergence.