That really is the turning point for the arcades. With the hardware less than equal to consoles, it's extremely hard for the developers to come up with an arcade only experience but at the same time, they need to make experiences that they can somehow monetize on consoles or phones, etc.
One of the main reasons for Taito to not make an all out powerhouse PC board is the cost. If it's too high then they can't sell the machine outside of Japan which was the the biggest issue with X and X2. KOF was a huge hit in emerging markets like SE Asia and South America because the MVS hardware was so cheap and SNK priced MVS games accordingly ($2500 for Japan, $1000 for US, $500 for small countries). When KOF98UM and KOFXII, XIII hit, those countries couldn't afford them and the games' popularity tanked. (Yes, we know XII is a turd). A great example of market competitive pricing with the Y2 KOF2002UM PCB. It retailed for something ridiculous like $2000 in Japan. The World versioni n HK was less than half of that.