I don't think it'll have EOL soon. Not to mention, regardless of factory EOL, it has community openwrt build support. The Beryl AX is a small, but mighty router.
Imo I think they only EOL devices when they do not have any native OpenWrt support to handover most of its support maintaining the firmware.
So those with QSDK may be having a much higher risk of EOL over time, those older routers with the siflower chips are having even more extremely chance of being EOL especially since newer routers by GL-iNet aren't siflower and never supported by OpenWt atleast until recently I have seen some PR about this, but I know it is a very tricky platform.
There are also routers with 4g ability and other features these may be running on a propertairy driver not compatible with the OpenWrt license, and these may be forever on GL software and or may be harder to maintain, some drivers never get synced to newer kernels so it will be harder to get support for it.
Now we have the GL-MangoV2 but if I check the latest firmware I understand their decision very well, the firmware becomes too big for the flash size on these routers.
Honestly I don't think MT3000 is gonna go soon, but if the firmware becomes bigger over time I can see if that becomes an issue, imho I don't think its a good router for ADGH due to the space it's easily populated full maybe by even a single list
EOL will depend on how popular Beryl 7 will become. If they sell a lot of units and there is a constant demand for the router, then there will be a longer support.
Personally I don't think it is about popularity, this is how most companies do it, but they will create e-waste and some cannibalize their products which is awfull, when often there is still more juice left especially for the MT3000, I hope GL-iNet keeps it that way
Also to append:
OpenWrt always is and was about turning relative cheap but also older routers into routers which could do much more, similar an enterprise router could do, and I hope GL-iNet keeps promising to the same mindset and not become something like Apple , I would expect a longer support life due to the strong open source base.
Just because a router is supported by OpenWRT community, it doesn’t mean a manufacturer will provided long term support, when a product is no longer making them money.
As example. Asus RT-68U wifi router. It had 10 years worth of support from Asus, because it was one of their flagship products and was still on the shelfs being sold to customers even at local computer stores for 10 years. It has a huge 3rd party firmware support.
Other routers, from Asus, dont have any 3rd party support and have had a very short term support from Asus.
If a product is not making a company money, there is no reason for a company to support it. Especially since Gl-iNet is very small company compared to Asus.