The strongest aspects of any game in The Elder Scrolls franchise are the lore, and the almost unique role playing freedom offered within these games. I believe that as a direct result of the focus that goes into PvP, the quality of the primary elements of the game are dwindling. I can cite the unequivocal fact that DLCs seem to be in a never ending decline in overall content provided. Take as an example the sheer size and content in previously released zones such as Craglorn and Wrothgar, and compare them to newer minuscule zones like Elsweyr.
To further prove my point, you can take a look at the now abandoned Imperial City. Countless hours of work went into what was a PvP focused zone and DLC that was unsurprisingly received with disdain, and shortly after abandoned by the ever disastisfied PvPers. To conclude with Imperial City, this zone should have been put to better use, like the advancement of the storyline(no ***).
Furthermore i'd like to mention how the vast majority of negative thread created on the forums are coming from the PvP end of the spectrum. Proving that PvP is not only toxic by nature, but ultimately creates an unhealthy atmosphere for a game that would have enourmous potential, were it not for the presence of PvP. The perpetual malcontent of the PvP community, despite the many efforts from the developers to refine that aspect of the game, is all the testament you need to understand that you can't please these people.
Essentially, PvP adds nothing but toxicity and it's detrimental to the overall quality of the game. The dev team should be focusing all its serources into PvE content and story telling which is what ultimately drives an MMORPG, and The Elder Scrolls as a whole.