Of course. It's your money after all.
However you're not really saving any money unless you buy both. You'll pay what the going price is when the OLED unit is available.
If you sit out for a couple of years waiting for an OLED model, you'll just watch people play new titles on the new hardware. If you don't care about FOMO, that's not a problem. No one here cares if you play
Mario Kart 11 when it comes out or three years after launch. Even Nintendo is happy to take your delayed dollars. They don't expect all of their hardware console sales to happen in the first month.
That said, the Switch console hardware isn't that expensive. In fact, today's Switch prices are very competitive with previous generations when adjusted for inflation:
What did each game console cost when it launched? Here are prices for every major console released since NES, including how much they would cost with inflation.
www.digitaltrends.com
Nintendo doesn't make big margins on their consoles anyhow. They make fatter margins on software titles, peripherals, merch and other tie-ins.
Ocarina of Time was $59.99 MSRP at its 1998 launch. That's about $113 in today's dollars. So
The Legend of Zelda: Tears of the Kingdom at $70 MSRP (even with the $10 increase in MSRP) is about 38% cheaper. Factoring in inflation (which one must), gaming is cheaper today than it ever was.
And Nintendo is less about the hardware anyhow. It's really about platform exclusive software: Zelda, Mario et al.
(Disclaimer: I am the happy owner of a Switch OLED. I did not own the original LCD model.)