Current news says altcoin price bubble and negative news about CoinDesk forfeitures are a concern. Price/Profitability appears to be pulling back for now but do your research carefully before investing in good quality ASIC miners (not high end GPU's), etc.
Do a cost vs ROI comparison (i.e., L3 vs S9 Antminers). Also, must consider good quality 220 volt power supply and available power costs, available cooling/facility and, acceptable noise levels (very noisy).