Your idea may have some merit solely in terms of publicity; but in terms of working out glitches I will attempt to temper it with this reply: The responsibility of the glitches is likely due more to Obsidian's shortcomings than it is due to Bethesda's; so it's not really applicable to say that Bethesda will take more time to "get this one right" since technically New Vegas' glitches were Obsidian's fault. However, as even we fans here have difficulty distinguishing that difference, you're probably correct in that the perception is that the glitches are a result of Bethesda's deficiency. The other issue is that New Vegas was built on the same engine as Fallout 3. The new game is being built on a revamped engine that is not the same as NV's engine; so to argue that they'd need more time to work out the bugs is irrelevant.
As far as publicity is concerned and perception, Bethesda's name is the lead name on all their advertising, on the listed Bethesda forums and game sites. Their name is front and center. Regardless of the specific responsibility of the glitches, I would find it hard to believe that Bethesda wouldn't take a great deal of extra testing out time once the game is completed because Bethesda has no way to distance itself from New Vegas nor should they even try to do so. Bethesda Studios stated that they, in conjunction with Obsidian, were actively working on an update for release, "as soon as possible" to address in-game issues for New Vegas. I would assume that means they have pivoted greatly in New Vegas' direction to try to keep buyers from returning the game to stores.
New engine withstanding, I'd still speculate they will take extra time based on how New Vegas came stumbling out of the gate. It would be wise to do so.