vampires can be played even without synchro. plaguespreader sure opens new possibilities for this deck but the synchro options are very unimpressive for now.
zombie ha des at least stops nemesis warrior's effect and some other graveyard plays. red-eyes zombie only becomes a good beater with zombie world but that would mean replacing vampire kingdom. even with zombie world, it's still just a beater at the end of the day with no protection or powerful effect. yea, very unimpressive.
btw, that vermillion mech synchro is Lame. plaguespreader gets banished after a synchro if you used gozuki/samurai skull to send it to the gy so you can't use it's destruction effect. it would just be another beater.
^this is how vermillion is commonly used: you synchro summon vermillion and then activate its effect (to destroy a card) by banishing the tuner used to synchro summon it from the graveyard.
my point is, since plaguespreader gets banished after you synchro summon vermillion, there won't be a tuner ready to be used for vermillion's effect to activate.