How is this different from de_dustanesi or many other maps currently available on the server? Vaga/Santa/Spidy can all plant the bomb in the first 15 seconds if not less, and unless you have one of those races, it is quite hard to make it to the bombsite with reasonable enough time to defuse and kill those covering the bomb. However, this map still gets played. Maybe not as often as the more popular maps, but played nonetheless. Many maps currently on the server have this issue. People counter them or RTV. One of my favorite strategies on maps such as these is switch to molecule, buy a kit and hide near the bombsite. Ignore everything after the bomb is planted and go for the bubble defuse.
People whoring races is part of the game. I have come to accept this and have thus learned to counter most of the races. It doesn't work every round (What being molecule so I switch to shadow hunter), but it sometimes does. If this gives me trouble still, (not enough team support to sneak up behind him/bad luck with hex) I'll pick a different strategy; say Spiderman, Jack, or even Undead armed with flashbangs. If people ask nicely, I'll almost always switch races if my team is dominating. However, people raging with no attempts of being amiable will typically just causes me to continue playing that race. As long as I am not carrying my team, I will also often offer to switch teams to try to balance them (though people typically turn me down

).
There are also races that typically fair much better when the scores are widely skewed, especially if the team organizes. For example; two players switch to Bloodmage and pick a nice spot where they can light a campfire for the first minute or so and 2-3 people switch to Magician and after rushing to their deaths proceed to buy cloak, ring, health or cloak, ring, lace when they proc bird. Cloaked birds fair very well on maps without skyboxes and can even defuse the bomb with a kit before the Ts notice and manage to shoot them.
Just because a map may give some races an advantage, doesn't mean they should be disqualified. The CTs can get to the bombsite with those races just as quickly. Humans have this advantage on other maps (human on aztec in the water under bridge or in the rafters of assault). Santa and Vaga are both absurd on crackhouse and dolls and yet these maps are played many times every day. Santa and vagas--after the first laces are bought--are neigh useless on office whereas other races, such as shadow hunter and nebula are much better then on other maps. Spiderman is just good on nearly every map. Not much you can do about that except changerace and counter it.
Just remember, WCS is just a highly complex game of rock/paper/scissors with hundreds of possible combinations--thousands with full teams--played with guns. If the map is playable and allows interesting new strategies to be formed it would be a valuable asset to the server.