DnDBeyond is a tool that you can use to play your campaign. It also has and offers the rule books but also campaign books digitally for your account.

So no, when you rely exclusively on the hardcopy books that you have to play the campaign, then this wouldn’t really matter much to you. However, when they decide that you cannot use DnDBeyond to keep track of your campaign and characters and so on with a previous version then you would either need to convert to those new rules or not use DnDBeyond anymore.