I dont think so.
Trying to copy the Canon EOS or Nikon F mount without agreement from Canon or Nikon might not even be legally possible (aka patent war). Even if that wouldnt be an issue, the whole idea introduces a big buttload of compability issues, since these mounts arent officially documented.
Also Sony already has failed to beat Canon and Nikon in their own turf with their DSLRs / SLTs. Sony/Minolta A is a niche. I dont see how retrying with a new mount would change anything about the outcome.
But right now Sony's FE system seems to be a big success.
What Sony now needs is IMHO thus:
- More great Glas for Sony FE. For example a 85mm f1.4 thats on the same level as the 35mm f1.4 would cause many happy campers.
- Even more great Glas
- Also, great Glas
- Fixing the aforementioned issue with their raws (come on, thats downright trivial)
- Aaaand ... dont forget Glas.
- Come up with a flash system thats compareable in quality to the Nikon solution
- Glas ?
- Better video ... always. Like an A7s2 with internal 10 bit 4k recording.
- Glas !!!!!
- Fix their ergonomic issues, specifically their menu system, specifically a well integrated touchscreen.
- GLAS !!!!!!!!!!!!!!!!!!!!!!!
- Just in case you have missed it so far: Yes Sony needs a broader set of excellent glas. Theres plenty around now thats good, but its a bit uneven right now and certain areas are still missing.