Alright, a baseless rumor for you kids.
Someone among the H!P Eggs will be the "successor" to Ayaya. That is, someone will make a solo debut. Let's speculate.
Well, some names I could throw in there:
Kanon Fukuda - very young but has the whole package, and one of the Eggs with the most experience
Sayaka Kitahara - cute, seems to have a good personality, decent voice, but hasn't been especially pushed
Saki Ogawa - very young but has the whole package, has got a push
Yuuka Maeda - cute voice and looks, has got some push; however, no strong personality so far
Erina Mano - very cute, seems to easily brainwash new fans, however, she's already in Ongaku Gatas, not a strong singer
Saki Mori - a stand-out personality, a weirdo, decent voice, tries hard to be a good idol; hasn't been especially pushed
Being pushed could be a bad or good thing; when Ayaya debuted, didn't she come a bit out of nowhere? She wasn't a backdancer to anyone or the like, right? I don't actually have any idea cuz I wasn't around then. But if they want this possible successor to be a surprise, then I'd think it's not Kanon Fukuda, Saki Ogawa or anyone in Ongaku Gatas. Instead someone who has been sort of trained in silence and has only done some "obligatory" appearances, like H!P concert backdancing and the Egg concerts. But if they've wanted to advertise this successor beforehand, it's the absolute opposite situation, and someone like Kanon, Nocchi, Saki is likely.
Weird how it's easy to name some of the youngest eggs for this. Ayaya was already a young lady (in looks) when she debuted, so I dunno.
Anyway it's just a rumour, but I love to speculate!