I can't agree with this part. GBA and DS really ran side by side, so that Nintendo could keep both options alive. The GBA even got better first party games during 2005. That's not going to be the case for 3DS vs. Switch at all, because Nintendo's new console will absolutely destroy the 3DS this year in terms of first party content. This transitional period is like DS to 3DS and other previous handheld generation transitions, except for GBA to DS. Nintendo's old handheld has always got additional first party games after the new one was already out.
People in this thread interpret too much into the statement that Nintendo will show content for the 3DS at E3. Firstly, about the only new announcement anyone realistically expects at this point is Pokémon Stars as a 3DS and (likely) Switch game. Secondly, Nintendo's unreleased games (Pikmin, Ever Oasis) obviously qualify as content. Thirdly, third parties are not done yet with the 3DS and their games qualify as content too. Reggie didn't say anything about Nintendo announcing new 3DS games.
i elaborated and said that 1st party 3DS games are small outsourced titles or late localizations while Switch 1st party titles are by the major studios. all i meant by that was 3DS & Switch will coexist for about a year or so before sales completely falter and support dries up.
When the herd loses its way, the shepard must kill the bull that leads them astray.