No. Nintendo is still on track to hit their sales goal for the year. The pressure wont really build until the fiscal year concludes. As fans, impatiently waiting causes us to hope they feel pressure so we can get this thing announced sooner rather than later, but the reality is Nintendo is feeling no pressure at the moment. The top 10 best selling games this past week in Japan were all Switch titles. Things are certainly on the decline, but they have in no way fallen off the cliff.
With the success of the Switch and the sustained year after year demand Nintendo likely feels good about long generations going forward. Nintendo has very little competition in the portable market and with what we know about T239's specs, it will be a very capable portable console for the next 7-8 years. With this plan, it may have made sense to spec the hardware for the long term. For example, 16GB of ram could be considered a bit overkill for it in 2024, but six years later not so much. Same with internal storage, they could get away with 256GB of internal storage in 2024, but if they choose to go with 512GB, that will be a blessing years down the road.
Even though I do expect fast internal storage for SNG, I expect MicroSD cards to be the solution for expanding storage. Not all games will require the fast internal storage, and the speeds for MicroSD are fast enough to make swapping to and from internal storage acceptable. Perhaps the reader will support the newer high speed MicroSD cards, but I do not see it being mandatory.