Of course the next system will have Nvidia components, they signed a long-term deal. The Switch is only responsible for a small part of Nvidia's revenue, they make some serious money, you can see that reflected in their share price(x5 times that of Nintendo's) and their overall revenue. They had revenue of $9.71 billion for the year, so while $450 million revenue for the Tegra processor is great, a small fraction of that is down to Switch by the way and it's about 1/4 of what they make from the gaming sector, $1.74 billion. Nvidia have many fingers in many pies.
So ya, in summary, maybe a hundred or two hundred at a stetch is possibly down to the Switch, but out of $9.71 billion, it's played a tiny part in their overall profits.