There is no "leaving alone" in geopolitics. Not disagreeing with you and in fact wish the same but I've become more cynical the more history and political literature I read. Geopolitics is one of the few zero sum games and the winner is always the most powerful and there always competition to be at the top. If the west falls, there won't be a sudden live and let live world order. The removal of one power is the signal for the next biggest power to swoop in and take up the mantel. The only way for black countries to be free is to compete at the same level in order to deter people who wish to interfere in your affairs and to also be able to enact influence. "Playing nice" in such a world is always a losing position.
West Africa won't be left alone and if anything this is probably the new cold war like proxy war between east and west, and once again the Africans are the pawns. This means external forces will increase their attempts to control them or influence them.
I watched that speech by that leader in Burkina Faso and the dude is going places, very charismatic, and makes you want to cheer him like a fellow warrior during a battle scene from Braveheart or some shyt. But he mentions in the same speech how they don't want be pitied or beggers to the west and become self sufficient, but turns around and praises Russia for promising to send grain to meet their needs. Russia isn't doing this for free obviously and Russia is simply wishing to take the place of the west. Whether that is good for them is yet to be seen but the west will not leave that alone and at least in the near future, you will see more intervening in west African affairs at this rate than any point in recent history as the tension between OUTSIDE forces play within various African countries. Once again, you have to ask, does the average person benefit from this?
It's obvious the previous status quo wasn't working for these countries and so an alternative is obviously worth trying. But, I have doubts in the long run that these new external alliances will turn out well.
I'm not going to pretend to be an expert on this stuff and just giving my perspective from my limited knowledge