If you find out that your current ram is obsolete, you probably have lots of other ancient stuff in your computer too. By the time your ram is too slow or there isn’t enough of it, your CPU is going to be abysmally slow by modern standards. Even if your mobo is still fine at that point, it won’t support any of the upgrades you have in mind, so you’ll end up changing everything anyway.
If you find out that your current ram is obsolete, you probably have lots of other ancient stuff in your computer too. By the time your ram is too slow or there isn’t enough of it, your CPU is going to be abysmally slow by modern standards. Even if your mobo is still fine at that point, it won’t support any of the upgrades you have in mind, so you’ll end up changing everything anyway.