I still like the good old days of working well on mining directly from multiple pc's. This degree of ease is needed for the coming promotion to incentivize smartphone app users to be reward for engaging in PC mining activities from time to times. The more app users the less need for any users to do wallet mining as frequently and be rewarded.

In this respect, the late stage of mining (after 3 years), the block reward should be minimal and only having a token value, and acting only as the basis for rewards (not from the mining activity itself). This implies that halving of rewards should be much faster than coin price increase and the block reward would be close to only the transaction charge by the node which should be quite low, not the $10-20 by BTC.  Otherwise, multi-algo or not, any significant increase in block reward value would cause mining to concentrate on a few high-power miners, happening to BTC, and making Joincoin pc-mining impossible.

The present around 10% annual increase of Joincoin market cap from mining is more than twice of the 4.6 % annual increase in BTC. The Joincoin has to be 2x or more attractive than BTC, at least in the short-term, in order to appreciate more than BTC.

These two factors are the stumbling blocks to attract regular coin users (and some of them would become pc-miners and network supports) and gain price supports.

In short, re-introduction of halving of mining reward should be necessary.