the rush isnt dead, its just harder and less viable in 1v1.
its generally better to age with a decent eco and ship 5 cossacks to raid and scout.
based on what you see it might be best to ff but in alot of cases you can make 5 muskets to defend vs the 3 hussar shipment and ship the 13 strelets.
Then attack by first looking for vills around his base and then pull back when he garrisons. If he starts pumping out LI to beat back strelets just make more strelets. once you beat down his army then make more muskets to seige the houses and tc.
the longer you keep your opponent in age 2 the bigger advantage you have since you can ship fencing school, boyars and team dueling school to have a 60% reduction in train time for strelets and muskets along with a good mili boost to both also.
its more of a longer suffocating rush than a quick power rush and its probably harder but it still works against most civs. Otto and spain are obviously harder to do it on but the 5 cossacks can make a huge difference if you can raid successfully. of course, if raiding isnt your strength then your up the creek already.