How long will staking be this profitable?

I mean we are enjoying now 5-10%, more or less, staking rewards from our favorite coins but for how long? How long until they will be at the same level as saving account returns of today? In uk the average for a savings account is 0.06% and considering that the inflation eats up 2% of your purchasing power every year, keeping it in a savings account is not that great of and idea. Or it is possible that crypto will never hit that low of a percentage?