I hope/think that Apple is thinking that bringing back the cheese grater or in other word a PC running MacOS is not going to be enough to bring back the pro. They need to come back with something that has something unique.
The TrashCan failed but you can see where Apple was going. A small, silent, powerful machine infinitely customisable on the fly via TB.
So of course if failed and this attempt has a good chance to fail too. I'm not quite sure that Apple has in its DNA the deep understanding of the type of Pro that are not content with either the iMac Pro or MBP in the same fashion they get the consumer sphere. It is just that for a long period of time the intersection between the 2 world was large but are now diverging. Perfectly happy for me to be wrong though.