There's already a Facebook group with a massive 699 followers and, showing the joined up thinking, two twitter accounts with around 1000 followers between them. I'm not sure how representative that is of the 114,000 people that live in Preston. But talk is cheap.
It's not just Preston they represent though is it? It's all the people on Earth who want the bus station to be "saved". The City of Preston as a whole (i.e. not just the settlement) is over 130,000, while the urban area, including Leyland, Chorley and others, is in the region of 270,000. And this is allowing for the fact that Chorley is larger enough to boast its own (and far more efficient) bus station facility.
Now consider the population of the city in relation to the number of bus stands in the bus station. The town I grew up in, whose bus station was rebuilt less than ten years ago (and is now considered "inadequate" as a result), has a population of 170,000+ in an urban area bigger than that of Preston and Central Lancashire - but its bus station has just 12 stands, of which only five are actually in the bus station itself and not on one of the streets around it. That works out as one stop for every 14,166 people. Preston's works out at one stand for every 1,425 people - all of which are in the actual bus station. On this evidence, Preston's bus station has almost ten times as much capacity as the one in Southend.
Also, 669 followers is
not massive. That represents roughly one person for every 10.5M on the planet.