With the playercount increasing so rapidly, I think it is important for the number of towers to increase as well. More playercount = more players in towers, which means only stronger guilds will be able to hold them. This destroys the ability of someone who is new or newer to the game that isn't part of a well-established guild to take and control the tower for any significant length of time. Only the guilds that are extremely managed and significant in the community are able to hold towers at this point, and I think with these guilds comes a certain degree of exclusivity that is unfavorable toward newer players. More towers could be added to alleviate this issue by spreading people out.

Of course, you don't want the map to get too crowded. But I am always a proponent of expanding the map, as long as it is done in quality, because I think a larger world becomes more immersing and the most fun I've ever had on Classic was exploring around the map.