I certainly don't want any of the historical rides removed; even though some of them aren't to my personal taste, many people like them and there's a good reason why they are there, in my opinion! Without them, Blackpool wouldn't be Blackpool!
As much as I would love a park filled with shiny, modern coasters, Blackpool is a very unique sort of park where its heritage is part of its appeal, if you get what I mean. There are many places worldwide where you can go to ride a Mack launch coaster, an S&S shot tower or a Vekoma SLC. But there are few places left where you can experience a wooden mobius loop coaster, a classic steeplechase coaster or a vintage ghost train, amongst others. These older attractions might not be to everyone's taste (including, in some cases, my own), but to me, these vintage rides are part of the fabric of Blackpool Pleasure Beach; without them, the park wouldn't be what it is today, and they wouldn't have been able to build wonderful new rides like Icon and become the park they are today.
There are many new parks being built worldwide at right this moment. There's a good chance that a substantial percentage of them have some sort of multi-launcher or similar modern, shiny coaster type; something like Icon. Maybe some even have multiple. However, I'd imagine that none of them have attractions like Grand National, Big Dipper, Steeplechase or even the Big One, to name just a few. Blackpool have some genuinely unique attractions within the park, and I personally think that going forward, it would be worth trying to treasure all of these more unique attractions as well as building new ones, because while my personal preference leans towards the newer rides, as my top 10 might imply, there's nothing in the world quite like some of the attractions at BPB. If I owned Blackpool Pleasure Beach, I agree with
@Dipper_Dave in saying that the only coaster I would personally choose to remove from the park is Infusion, even though I wasn't personally a fan of some of the other coasters. My reason for this is because the other coasters are unique to the park, whereas with Infusion, you can find 26 others with the same layout worldwide, and that's excluding all of the bonus helix models, Shenlins and custom SLCs.
So what I'm essentially trying to say before I ramble on for too long is that even though not all of them are to my personal taste, Blackpool should try and preserve some of their more unique attractions, in my opinion. BPB really is one of the most unique theme parks in the world, if you ask me, and I think the older rides are a large part of what make it so unique.