Brahma has a couple of temples today. Rudra (Siva) and Vishnu (counting his Avataras also) have hundreds if not thousands.
How about Indra, Agni, Soma, et al., and in particular Vayu, who has a high standing among Madhwists?
(Temples to Vayulinga like Kalahasti would count as temples to Siva.)
I'm not counting the immensely popular Durga, Kali, Hanuman, Murugan, Ganesa, et al as Rig Vedic Gods.