I've had the same thought a few times but just playing devil's advocate:
- Casemiro + Mainoo are not a very defensibly mobile pair of CMs, therefore Eriksen's defensive liability is a meaningful weakness vs Bruno's work-rate
- Rashford/Garnacho are not possession-oriented players who could play off Eriksen effectively, therefore Eriksen's primary strength is somewhat nullified
It's a shame though, as I think there is a different lineup of players in which Eriksen could still succeed as a #10 for another year or two at the top end of the table. On top of that, I also think a lineup in which Eriksen could succeed as a #10 would very likely be a better team playing good possession football, but that's just not the set of players we have.