Student or Learner
Might as well you get a taxi. (Does it mean it is better you should get a taxi)
with kind regards
The phrase "might as well" means "it's what I/you/we/he/etc should do, even though there is some reluctance about it."
Looks like your blind date stood you up. Might as well have a nice dinner anyway. (Even though it would have been nicer if your date had actually shown up.)
I think the party is over. Might as well see if we can find a taxi. (Even though it would be fun to stay a little longer.)
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.