Spelling should be left exactly the way it is, other than whatever �natural' changes - accepted by the majority of users - may occur to it over time. Under no circumstances should it be deliberately �simplified' or otherwise tampered with.
Why? Because only the ignorant think words are just sounds. On the contrary, they have an origin, a meaning, a history and a development. 'Yacht', for example, comes from a Dutch word 'jaghtschip' or 'jachtschip' - where the 'j' is pronounced 'y' and the 'gh/ch' is pronounced as in Johann Sebastian Bach - meaning a ship for hunting/chasing. (In fact, in the north-east of Scotland, yacht is still amongst sea-going folk pronounced in exactly the same way as it was in the old Dutch word.) If we spelt it 'yot' - which is roughly how it sounds - that whole linguistic, cultural, geographical and historical association would be lost to future generations.
The ee-sound can be spelt as in: seem, team, convene, sardine, protein, fiend, people, he, key, ski, debris and quay. There are eleven ways of pronouncing ough in British speech, though only eight in �standard' English. There are also eleven ways of saying the sound represented by a, as in age, bad, bath, about, beat, many, aisle, coat, ball, beauty and cauliflower. In my view, long may these and similar anomalies exist! They're full of meaning which should not be dumbed down.
Under any simplified system, we would be unable to distinguish aisle, isle, I'll or sew, sow, so or aye, eye, I or flew, flu, flue or a lot of other homophones. It's bad enough that such nonsense is widespread in text messaging. "CUL8R"...I ask you!