I'd disagree given the simple fact that the Garand was the more mature and reliable design, .30-06 is an all around superior cartridge to 54r, and if we're looking at modification the Garand can easily be made magazine fed and converted to 7.62 NATO with fairly minor modification and scope mounting also requires minimal modification. The Italian BM59 is basically the M14 but sooner and represents (imo) what the M14 should have been, minus the rifle grenade feature. I think the BM59 is superior to a theoretical modernized SVT-40 or the SKS.
ETA: Of course this theoretical is largely moot anyways due to the development of the AK, M16, and theoretically the continued development of the EM-2.
ETA2: Now that I think about it, the Ruger Mini 30 with the Hannibal rail is kind of the ultimate development of the M14 concept. Although technically the Ruger Mini is an M1 Carbine development rather than a Garand development. The Mini 30 is the ultimate SKS if nothing else.