Doubt it. Since when is their fee a flat 50c btw? Afaik they're free now (beta) and going live next month at 0.5%.
And let's not forget, they have a presence in North-America, Western-Europe and Australia. Not even e.g. Japan. And hell, they're in beta in all of those countries except five.
But more importantly, they're not a remittance company. So I really doubt we'll see a remittance product from them anytime soon.
But who knows. It's a legitimate business venture. If you can process a payment in bitcoin and pay out in a local currency and do remittance that way, you can process a remittance 'payment', too. The problem isn't really the technical or business part though, it's that it brings up a lot of KYC/AML responsibilities that facilitating retail shopping doesn't. So unless you want to really build out a remittance product, you can't just do something like this 'on the side'. And Stripe is way too focused on payments to jump into remittance properly anytime soon.
Especially when there aren't any deep liquidity pools for bitcoin in Africa (i.e. a lack of exchanges). Phillipines, India, all of that could feasibly happen soon (not by Stripe, but other companies), as liquidity does exist (and they're big remittance corridors), but undercutting Bitpesa anytime soon is unlikely. Bitpesa itself is already hustling to make this work with a local presence and its a bit of a mystery to me who their liquidity provider is atm.