It's not black and white. ATM our whole squad is suited to Bale. We aren't going to replace him, so we will need to at the same time sign talented replacements and adapt our squad to a slightly different playing style. These replacements and alterations will cause a lot of disruption, which will last for at least half a season. For that reason we also aren't going to sign all the replacements in one window, which will make the transition to life without Bale even longer. In which time Sandro et al could be pushing for an exit.
Of course it is possible, but we will have to be absolutely on fire after January because it will take time. As things stand, if we sign Soldado, we will be set to hit the ground running next year, get that CL qualification and build further. We have had enough disruption over the recent years, I think stability should be valued and we should not sell.
That said, £100m could quicken the recovery process nicely... Literally no one has ever had a war chest like that to recover with. Problem is every man and his dog will know we have that money burning a hole in our pocket and we could end up paying £30m for players worth £15m and regress dramatically. Ideally we wouldn't risk it...