I've noticed that the big four manufacturers (honda, suzy, kawi, and yamihammer)don't make small on-off road bikes anymore.Why is this?

I've noticed that the big four manufacturers (honda, suzy, kawi, and yamihammer)don't make small on-off road bikes anymore. Why is this? - 1

They have to follow the fads. All successful businesses have to pay strict attention to fads.

It's all about profit.
not enough sales = not enough profit.

Not enough profit in them.

They make 125 cc bikes and scooters so go look at the brochure.

Everyone thinks bigger is better. They do make them, but not usually for sale in USA. Asia is full of them.

They make a few-- but for 'domestic' aasian markets with bad rodes. India has them, mexico makes some based on suzuki--just not sold in US market much.

Yamaha TW200's are great. How'd ya miss it?

In the US, we *need* freeway capacity, hence for a few decades the smallest dual-sports are 200cc to 250cc.
Honda has one. Kawasaki has one. Suzuki has two, Yamaha has three:

http://powersports.honda.com/...treet.aspx
https://www.kawasaki.com/Products/2018-KLX250
http://www.suzukicycles.com/Product%20Lines/Cycles/Products/DR200S/2018/DR200S.aspx
http://www.suzukicycles.com/Product%20Lines/Cycles/Products/RV200/2018/RV200.aspx
https://www.yamahamotorsports.com/dual-sport/models/wr250r
https://www.yamahamotorsports.com/dual-sport/models/xt250
https://www.yamahamotorsports.com/dual-sport/models/tw200

Since you are a Canuck:
https://www.kawasaki.ca/product/klx250
https://www.suzuki.ca/?q=en/node/4023
https://www.yamaha-motor.ca/products/list.php?group=MC&catId=13

I'm sorry that you are a dotard, although probably not mentally deranged like our President.

Ever ridden a small cc motorcycle on the highwayIfreeway, WAY NOT too much fun (like kissing your aunt at a wedding, lucky when you get somewhere with that BUT… )

In the US sales would be terrible.

Because you live in an area of the world where there's not the demand. They still make the small on/off road bikes, they just do not bother to export them to you.