Blockchain is really complex and complexity is costly.
What Bitcoin and other true blockchain systems managed to do is to hit a "sweet spot" where the incentives are powerful enough to mobilize the necessary collaboration level needed to maintain such a complex system.
My prediction is that, absent incentives, Fabric-based systems will prove so costly to run that at some point companies will realize that they are not worth maintaining, as to do the business they are doing, the way they are doing it, a much-cheaper-to-run classical system does the job.
After having wasted (for the shareholders) a lot of money (but made a bunch of money for IBM), they will sound the retreat.