I don’t know their cost, so i don’t know price/performance of these just announced camera’s.
But ‘is it worth it’ is something you have to answer for yourself anyway 
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The quick downside i can imagine , is lens selection. It’s a newish mount and Canon has been making awesome glass and has been filling their RF selection quickly…
… but that’s all full frame. So you might end up with an aps-c sensor with only expensive big full frame glass to buy for a while .
Sony also has neglected the aps-c E mount selection for quite a while , but the 3re party lens market is quite active there , with nice choices across a range or quality/price ratios. So there is something worthwhile for most budgets now.
I expect this will take some time with canon aps-c RF mount. And it means they will leave m-mount in the cold :(.
I thought it would be more logical to ‘relaunch’ m mount. Market the camera’s as siblings of the eos -r line and release new lenses to show you take it seriously , but at least the m-mount owners and existing lenses don’t have a dead end now . I don’t expect them to sustain both mounts.
(I always thought it was a mistake for Sony to make 1 new mount for both aps-c and ff… and now both Nikon and Canon are doing the same…).
Oh, and another drawback… Support in opensource software might take a while.
They being said , as a Sony user for years now , i think camera’s like the R5 and R6 are exceptional good camera’s that show me canon is back from the dead , and o would be very happy owning and using one.
The r7 as an aps-c eos-r line looks just as nice to me .
(The r10 you have to take care what features they removed to keep the price lower , it is canon after all).