Transformers 5 will make more/less than Age of Extinction

That seems to be the trend.

Transformers (2007)
Open 70.5M
Domestic 319.2M

Transformers ROTF (2009)
Open 108.9M
Domestic 402.1M

Transformers DOTM (2011)
Open 97.8M
Domestic 352.3M

Transformers AOE (2014)
Open 100M
Domestic 245.4M

I don't think it's drop will be as big as the 100M + drop that happened between DOTM and AOE, but it'll drop from AOE.