After doing some math, nintendo needs to increase their production up to two million a month to reach 150 million, which isn't unlikely, so I'll need to change my prediction.
I'm guessing they'll increase it to 2.0 this year in June, 2.3 next year, and 2.6 the summer after next, so around 180 million-200 million*.
*Rough estimates
Kimi wa ne tashika ni ano toki watashi no soba ni ita
Itsudatte itsudatte itsudatte
Sugu yoko de waratteita
Nakushitemo torimodosu kimi wo
I will never leave you