Fortunately, that resistance to migrate is unnecessary.
With many photographers currently using this migration strategy, these adapters are hard to find right now. The best course of action is to get in line. Place orders with a few of our recommended retailers (B&H | Adorama | Amazon | Canon USA) and cancel any unshipped orders when your desired number of adapters ship.
If you don't want to wait, consider the in-stock Vello adapter at B&H.
Sure, the Canon RF Lenses are always better than their corresponding DSLR lens model, and you will likely want to migrate to those models eventually. In the meantime, you might be surprised at how well your current DSLR lenses perform when a mirrorless camera is behind them. Expect the EOS R5 and R6 to focus your current lenses as fast as your DSLR and with better accuracy, especially when using the game-changing eye AF feature.